1# SPDX-License-Identifier: GPL-2.0 2# Put here option for CPU selection and depending optimization 3choice 4 prompt "x86-32 Processor family" 5 depends on X86_32 6 default M686 7 help 8 This is the processor type of your CPU. This information is 9 used for optimizing purposes. In order to compile a kernel 10 that can run on all supported x86 CPU types (albeit not 11 optimally fast), you can specify "586" here. 12 13 Note that the 386 and 486 is no longer supported, this includes 14 AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI 486DLC/DLC2, 15 UMC 486SX-S and the NexGen Nx586, AMD ELAN and all 486 based 16 CPUs. 17 18 The kernel will not necessarily run on earlier architectures than 19 the one you have chosen, e.g. a Pentium optimized kernel will run on 20 a PPro, but not necessarily on a i486. 21 22 Here are the settings recommended for greatest speed: 23 - "586" for generic Pentium CPUs lacking the TSC 24 (time stamp counter) register. 25 - "Pentium-Classic" for the Intel Pentium. 26 - "Pentium-MMX" for the Intel Pentium MMX. 27 - "Pentium-Pro" for the Intel Pentium Pro. 28 - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron. 29 - "Pentium-III" for the Intel Pentium III or Coppermine Celeron. 30 - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron. 31 - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D). 32 - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird). 33 - "Crusoe" for the Transmeta Crusoe series. 34 - "Efficeon" for the Transmeta Efficeon series. 35 - "AMD Elan" for the 32-bit AMD Elan embedded CPU. 36 - "GeodeGX1" for Geode GX1 (Cyrix MediaGX). 37 - "Geode GX/LX" For AMD Geode GX and LX processors. 38 - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3. 39 - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above). 40 - "VIA C7" for VIA C7. 41 - "Intel Atom" for the Atom-microarchitecture CPUs. 42 43 See each option's help text for additional details. If you don't know 44 what to do, choose "Pentium-Pro". 45 46config M586TSC 47 bool "Pentium-Classic" 48 depends on X86_32 49 help 50 Select this for a Pentium Classic processor with the RDTSC (Read 51 Time Stamp Counter) instruction for benchmarking. 52 53config M586MMX 54 bool "Pentium-MMX" 55 depends on X86_32 56 help 57 Select this for a Pentium with the MMX graphics/multimedia 58 extended instructions. 59 60config M686 61 bool "Pentium-Pro" 62 depends on X86_32 63 help 64 Select this for Intel Pentium Pro chips. This enables the use of 65 Pentium Pro extended instructions, and disables the init-time guard 66 against the f00f bug found in earlier Pentiums. 67 68config MPENTIUMII 69 bool "Pentium-II/Celeron(pre-Coppermine)" 70 depends on X86_32 71 help 72 Select this for Intel chips based on the Pentium-II and 73 pre-Coppermine Celeron core. This option enables an unaligned 74 copy optimization, compiles the kernel with optimization flags 75 tailored for the chip, and applies any applicable Pentium Pro 76 optimizations. 77 78config MPENTIUMIII 79 bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon" 80 depends on X86_32 81 help 82 Select this for Intel chips based on the Pentium-III and 83 Celeron-Coppermine core. This option enables use of some 84 extended prefetch instructions in addition to the Pentium II 85 extensions. 86 87config MPENTIUMM 88 bool "Pentium M/Pentium Dual Core/Core Solo/Core Duo" 89 depends on X86_32 90 help 91 Select this for Intel Pentium M (not Pentium-4 M) 92 "Merom" Core Solo/Duo notebook chips 93 94config MPENTIUM4 95 bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon" 96 depends on X86_32 97 help 98 Select this for Intel Pentium 4 chips. This includes the 99 Pentium 4, Pentium D, P4-based Celeron and Xeon, and 100 Pentium-4 M (not Pentium M) chips. This option enables compile 101 flags optimized for the chip, uses the correct cache line size, and 102 applies any applicable optimizations. 103 104 CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 ) 105 106 Select this for: 107 Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename: 108 -Willamette 109 -Northwood 110 -Mobile Pentium 4 111 -Mobile Pentium 4 M 112 -Extreme Edition (Gallatin) 113 Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename: 114 -Foster 115 -Prestonia 116 -Gallatin 117 118config MK6 119 bool "K6/K6-II/K6-III" 120 depends on X86_32 121 help 122 Select this for an AMD K6-family processor. Enables use of 123 some extended instructions, and passes appropriate optimization 124 flags to GCC. 125 126config MK7 127 bool "Athlon/Duron/K7" 128 depends on X86_32 129 help 130 Select this for an AMD Athlon K7-family processor. Enables use of 131 some extended instructions, and passes appropriate optimization 132 flags to GCC. 133 134config MCRUSOE 135 bool "Crusoe" 136 depends on X86_32 137 help 138 Select this for a Transmeta Crusoe processor. Treats the processor 139 like a 586 with TSC, and sets some GCC optimization flags (like a 140 Pentium Pro with no alignment requirements). 141 142config MEFFICEON 143 bool "Efficeon" 144 depends on X86_32 145 help 146 Select this for a Transmeta Efficeon processor. 147 148config MGEODEGX1 149 bool "GeodeGX1" 150 depends on X86_32 151 help 152 Select this for a Geode GX1 (Cyrix MediaGX) chip. 153 154config MGEODE_LX 155 bool "Geode GX/LX" 156 depends on X86_32 157 help 158 Select this for AMD Geode GX and LX processors. 159 160config MCYRIXIII 161 bool "CyrixIII/VIA-C3" 162 depends on X86_32 163 help 164 Select this for a Cyrix III or C3 chip. Presently Linux and GCC 165 treat this chip as a generic 586. Whilst the CPU is 686 class, 166 it lacks the cmov extension which gcc assumes is present when 167 generating 686 code. 168 Note that Nehemiah (Model 9) and above will not boot with this 169 kernel due to them lacking the 3DNow! instructions used in earlier 170 incarnations of the CPU. 171 172config MVIAC3_2 173 bool "VIA C3-2 (Nehemiah)" 174 depends on X86_32 175 help 176 Select this for a VIA C3 "Nehemiah". Selecting this enables usage 177 of SSE and tells gcc to treat the CPU as a 686. 178 Note, this kernel will not boot on older (pre model 9) C3s. 179 180config MVIAC7 181 bool "VIA C7" 182 depends on X86_32 183 help 184 Select this for a VIA C7. Selecting this uses the correct cache 185 shift and tells gcc to treat the CPU as a 686. 186 187config MATOM 188 bool "Intel Atom" 189 help 190 Select this for the Intel Atom platform. Intel Atom CPUs have an 191 in-order pipelining architecture and thus can benefit from 192 accordingly optimized code. Use a recent GCC with specific Atom 193 support in order to fully benefit from selecting this option. 194 195endchoice 196 197config CC_HAS_MARCH_NATIVE 198 # This flag might not be available in cross-compilers: 199 def_bool $(cc-option, -march=native) 200 # LLVM 18 has an easily triggered internal compiler error in core 201 # networking code with '-march=native' on certain systems: 202 # https://github.com/llvm/llvm-project/issues/72026 203 # LLVM 19 introduces an optimization that resolves some high stack 204 # usage warnings that only appear wth '-march=native'. 205 depends on CC_IS_GCC || CLANG_VERSION >= 190100 206 207config X86_NATIVE_CPU 208 bool "Build and optimize for local/native CPU" 209 depends on X86_64 210 depends on CC_HAS_MARCH_NATIVE 211 help 212 Optimize for the current CPU used to compile the kernel. 213 Use this option if you intend to build the kernel for your 214 local machine. 215 216 Note that such a kernel might not work optimally on a 217 different x86 machine. 218 219 If unsure, say N. 220 221config X86_GENERIC 222 bool "Generic x86 support" 223 depends on X86_32 224 help 225 Instead of just including optimizations for the selected 226 x86 variant (e.g. PII, Crusoe or Athlon), include some more 227 generic optimizations as well. This will make the kernel 228 perform better on x86 CPUs other than that selected. 229 230 This is really intended for distributors who need more 231 generic optimizations. 232 233# 234# Define implied options from the CPU selection here 235config X86_INTERNODE_CACHE_SHIFT 236 int 237 default "12" if X86_VSMP 238 default X86_L1_CACHE_SHIFT 239 240config X86_L1_CACHE_SHIFT 241 int 242 default "7" if MPENTIUM4 243 default "6" if MK7 || MPENTIUMM || MATOM || MVIAC7 || X86_GENERIC || X86_64 244 default "4" if MGEODEGX1 245 default "5" if MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MVIAC3_2 || MGEODE_LX 246 247config X86_F00F_BUG 248 def_bool y 249 depends on M586MMX || M586TSC || M586 250 251config X86_ALIGNMENT_16 252 def_bool y 253 depends on MCYRIXIII || MK6 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODEGX1 254 255config X86_INTEL_USERCOPY 256 def_bool y 257 depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK7 || MEFFICEON 258 259config X86_USE_PPRO_CHECKSUM 260 def_bool y 261 depends on MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MATOM 262 263config X86_TSC 264 def_bool y 265 depends on (MWINCHIP3D || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MATOM) || X86_64 266 267config X86_HAVE_PAE 268 def_bool y 269 depends on MCRUSOE || MEFFICEON || MCYRIXIII || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC7 || MATOM || X86_64 270 271config X86_CX8 272 def_bool y 273 depends on X86_HAVE_PAE || M586TSC || M586MMX || MK6 || MK7 || MGEODEGX1 || MGEODE_LX 274 275# this should be set for all -march=.. options where the compiler 276# generates cmov. 277config X86_CMOV 278 def_bool y 279 depends on (MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || MATOM || MGEODE_LX || X86_64) 280 281config X86_MINIMUM_CPU_FAMILY 282 int 283 default "64" if X86_64 284 default "6" if X86_32 && (MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MEFFICEON || MATOM || MK7) 285 default "5" 286 287config X86_DEBUGCTLMSR 288 def_bool y 289 depends on !(MK6 || MCYRIXIII || M586MMX || M586TSC || M586) && !UML 290 291config IA32_FEAT_CTL 292 def_bool y 293 depends on CPU_SUP_INTEL || CPU_SUP_CENTAUR || CPU_SUP_ZHAOXIN 294 295config X86_VMX_FEATURE_NAMES 296 def_bool y 297 depends on IA32_FEAT_CTL 298 299menuconfig PROCESSOR_SELECT 300 bool "Supported processor vendors" if EXPERT 301 help 302 This lets you choose what x86 vendor support code your kernel 303 will include. 304 305config BROADCAST_TLB_FLUSH 306 def_bool y 307 depends on CPU_SUP_AMD && 64BIT 308 309config CPU_SUP_INTEL 310 default y 311 bool "Support Intel processors" if PROCESSOR_SELECT 312 help 313 This enables detection, tunings and quirks for Intel processors 314 315 You need this enabled if you want your kernel to run on an 316 Intel CPU. Disabling this option on other types of CPUs 317 makes the kernel a tiny bit smaller. Disabling it on an Intel 318 CPU might render the kernel unbootable. 319 320 If unsure, say N. 321 322config CPU_SUP_CYRIX_32 323 default y 324 bool "Support Cyrix processors" if PROCESSOR_SELECT 325 depends on M586 || M586TSC || M586MMX || (EXPERT && !64BIT) 326 help 327 This enables detection, tunings and quirks for Cyrix processors 328 329 You need this enabled if you want your kernel to run on a 330 Cyrix CPU. Disabling this option on other types of CPUs 331 makes the kernel a tiny bit smaller. Disabling it on a Cyrix 332 CPU might render the kernel unbootable. 333 334 If unsure, say N. 335 336config CPU_SUP_AMD 337 default y 338 bool "Support AMD processors" if PROCESSOR_SELECT 339 help 340 This enables detection, tunings and quirks for AMD processors 341 342 You need this enabled if you want your kernel to run on an 343 AMD CPU. Disabling this option on other types of CPUs 344 makes the kernel a tiny bit smaller. Disabling it on an AMD 345 CPU might render the kernel unbootable. 346 347 If unsure, say N. 348 349config CPU_SUP_HYGON 350 default y 351 bool "Support Hygon processors" if PROCESSOR_SELECT 352 select CPU_SUP_AMD 353 help 354 This enables detection, tunings and quirks for Hygon processors 355 356 You need this enabled if you want your kernel to run on an 357 Hygon CPU. Disabling this option on other types of CPUs 358 makes the kernel a tiny bit smaller. Disabling it on an Hygon 359 CPU might render the kernel unbootable. 360 361 If unsure, say N. 362 363config CPU_SUP_CENTAUR 364 default y 365 bool "Support Centaur processors" if PROCESSOR_SELECT 366 help 367 This enables detection, tunings and quirks for Centaur processors 368 369 You need this enabled if you want your kernel to run on a 370 Centaur CPU. Disabling this option on other types of CPUs 371 makes the kernel a tiny bit smaller. Disabling it on a Centaur 372 CPU might render the kernel unbootable. 373 374 If unsure, say N. 375 376config CPU_SUP_TRANSMETA_32 377 default y 378 bool "Support Transmeta processors" if PROCESSOR_SELECT 379 depends on !64BIT 380 help 381 This enables detection, tunings and quirks for Transmeta processors 382 383 You need this enabled if you want your kernel to run on a 384 Transmeta CPU. Disabling this option on other types of CPUs 385 makes the kernel a tiny bit smaller. Disabling it on a Transmeta 386 CPU might render the kernel unbootable. 387 388 If unsure, say N. 389 390config CPU_SUP_ZHAOXIN 391 default y 392 bool "Support Zhaoxin processors" if PROCESSOR_SELECT 393 help 394 This enables detection, tunings and quirks for Zhaoxin processors 395 396 You need this enabled if you want your kernel to run on a 397 Zhaoxin CPU. Disabling this option on other types of CPUs 398 makes the kernel a tiny bit smaller. Disabling it on a Zhaoxin 399 CPU might render the kernel unbootable. 400 401 If unsure, say N. 402 403config CPU_SUP_VORTEX_32 404 default y 405 bool "Support Vortex processors" if PROCESSOR_SELECT 406 depends on X86_32 407 help 408 This enables detection, tunings and quirks for Vortex processors 409 410 You need this enabled if you want your kernel to run on a 411 Vortex CPU. Disabling this option on other types of CPUs 412 makes the kernel a tiny bit smaller. 413 414 If unsure, say N. 415